The DC 10 was originally conceived as a twinjet. American Airlines
required that the aircraft be capable of operating from existing
runways. McDonnell Douglas added a third engine at the base of its
vertical tail of the DC 10.
The first transcontinental range DC-10-10s entered service with
American in August 1971. After the DC 10-10 a more powerful
intercontinental DC 10-30 was developed.
In total 386 civil DC-10s have been delivered. In 1990 the MD11 was delivered for the first